A characteristic of individuals with severe/profound mental retardation is:

Individuals with severe/profound intellectual disabilities often exhibit subnormal intelligence, which is a hallmark characteristic in this population. This subnormal intelligence typically results in significantly impaired cognitive functioning and adaptive behavior, making it challenging for them to engage with complex tasks or concepts. Such individuals require substantial support and accommodations in everyday life, and the level of care needed greatly exceeds that of those classified as having mild or moderate impairment.

In contrast to this characteristic, high independence, consistent performance at school levels, and artistic proficiency are generally not associated with those who have severe or profound disabilities. It is important to recognize that while every individual has unique abilities and potential, the defining features of severe/profound intellectual disabilities include substantial limitations across multiple domains of functioning, particularly in intellectual and adaptive capabilities.